If you install Dazstudio 4.5 you'll discover there are no base male/female genesis figures.......you'll find these figures in the GenesisStarterEssentials 1.3.......so yeah...you need to download and install.

No, that is an item for Hexagon modelling by Fugazi, and has nothing at all to do with the file 14812_GenesisStarterEssentials_1.3_trx.exe, which MUST be installed with the 4.5 version to get the latest Genesis figures in DUF format.

The duplicate IDs is a seperate problem. You may need to reset and redownload the items that are giving you that message to get the latest versions. There is also a script that can fix these errors, I'll see if I can find a link.